If that happens, don't bellyache when that candidate doesn't govern like you believe a "conservative" should. That candidate didn't compromise: you did!!!
Given a choice between someone I agree with 95% of the time, who has only a slim chance to win the general election, and someone I agree with 94% of the time who has a much better chance to win, I'll take that 1% loss rather than insist on the closest match to my views ... and then because of that inflexibility have to watch a socialist I agree with about 1% of the time stay in office for another four years.
BTW, if the GOP chooses a RINO who takes a slower approach to socialism than Obama and wants to bankrupt the country gradually rather than suddenly, I'm writing in my top choice instead of voting for either major party. I'm talking about compromising among the best choices, not going with another McCain.